Version 4
SHEET 1 1332 980
WIRE -80 -496 -176 -496
WIRE 16 -496 -80 -496
WIRE 448 -496 96 -496
WIRE -176 -464 -176 -496
WIRE 16 -352 16 -400
WIRE -176 -336 -176 -384
WIRE -80 -336 -80 -496
WIRE -16 -336 -80 -336
WIRE 256 -320 48 -320
WIRE 416 -320 256 -320
WIRE -16 -304 -80 -304
WIRE -80 -256 -80 -304
WIRE 256 -256 256 -320
WIRE 256 -256 192 -256
WIRE 320 -256 256 -256
WIRE 16 -224 16 -288
WIRE 192 -224 192 -256
WIRE 320 -224 320 -256
WIRE 448 -208 448 -496
WIRE 512 -208 448 -208
WIRE 576 -208 512 -208
WIRE 416 -144 416 -320
WIRE 512 -144 416 -144
WIRE 576 -144 512 -144
WIRE 192 -112 192 -144
WIRE 256 -112 192 -112
WIRE 320 -112 320 -160
WIRE 320 -112 256 -112
WIRE 256 -96 256 -112
WIRE 576 -48 416 -48
WIRE 816 -48 736 -48
WIRE 576 16 448 16
WIRE 816 16 736 16
WIRE -112 48 -208 48
WIRE -16 48 -112 48
WIRE 416 48 416 -48
WIRE 416 48 64 48
WIRE -208 80 -208 48
WIRE -480 144 -480 80
WIRE -384 144 -384 80
WIRE -16 192 -16 144
WIRE -208 208 -208 160
WIRE -112 208 -112 48
WIRE -48 208 -112 208
WIRE 224 224 16 224
WIRE 448 224 448 16
WIRE 448 224 224 224
WIRE -48 240 -112 240
WIRE -480 288 -480 224
WIRE -384 288 -384 224
WIRE -112 288 -112 240
WIRE 224 288 224 224
WIRE 224 288 160 288
WIRE 288 288 224 288
WIRE 160 320 160 288
WIRE 288 320 288 288
WIRE -16 336 -16 256
WIRE 160 432 160 400
WIRE 224 432 160 432
WIRE 288 432 288 384
WIRE 288 432 224 432
WIRE 224 448 224 432
FLAG -16 144 Vdd
FLAG -16 336 Vss
FLAG -480 80 Vdd
FLAG -480 288 0
FLAG -384 80 Vss
FLAG -384 288 0
FLAG -112 288 0
FLAG -208 208 0
FLAG 224 448 0
FLAG 16 -400 Vdd
FLAG 16 -224 Vss
FLAG -80 -256 0
FLAG -176 -336 0
FLAG 256 -96 0
FLAG 816 -48 IX
FLAG 816 16 IY
FLAG 512 -208 VX
FLAG 512 -144 VY
SYMBOL res 80 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 18k
SYMBOL res -192 176 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 6.2k
SYMBOL res 144 304 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL cap 272 320 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL voltage -480 128 R0
WINDOW 123 24 120 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage -384 128 R0
WINDOW 123 24 120 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value -15
SYMBOL MiddleBrook 656 -144 R0
SYMATTR InstName U2
SYMBOL res 112 -512 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 18k
SYMBOL res -160 -368 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R5
SYMATTR Value 6.2k
SYMBOL res 176 -240 R0
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL cap 304 -224 R0
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL Opamps\\LT1679 -16 224 R0
SYMATTR InstName U1
SYMBOL Opamps\\LT1679 16 -320 R0
SYMATTR InstName U3
TEXT -464 408 Left 2 !.ac dec 1000 10 1meg
TEXT -464 344 Left 2 !.lib Middlebrook.sub
TEXT -544 -688 Left 2 ;plot.defs\n.func Tv(x,y) {y/x}\n.func Ti(x,y) {y/x}\n.func LoopGain(vx,vy,ix,iy) { ( Tv(vx,vy) *  Ti(ix,iy) - 1 ) / ( 2 + Tv(vx,vy) + Ti(ix,iy))}\n \n-> LoopGain( V(Vx), V(Vy), V(Ix), V(Iy))
